chore(deps): update dependency sinon to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
sinon	devDependencies	major	^6.0.0 -> ^7.0.0	homepage, source

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Release Notes

sinonjs/sinon

v7.0.0

Compare Source

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• Update to Lolex 3: no negative ticks allowed

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[codecov-io]

Codecov Report

Merging #84 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #84   +/-   ##
====================================
  Coverage      84%   84%           
====================================
  Files           3     3           
  Lines          75    75           
====================================
  Hits           63    63           
  Misses         12    12

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